Grinding the treads of wheel rims for rail vehicles and the like



March 20, 1934. HANUs 1,951,977

GRINDING THE TREADS OF WHEEL RIMS FOR RAIL VEHICLES AND THE LIKE FiledSept. 28, 1951 2 Sheets-Sheet 1 Fig. 1.

x In ventor March 20, I 34. HANUs 1,951,977

GRINDING THE TREADS OF WHEEL RIMS FOR RAIL VEHICLES AND THE LIKE FiledSept. 28, 1931 2 Sheets-Sheet 2 face of a cone.

Patented Mar. 20, 1934 umro STATES FATE tries,

E al Haws Be in-H ma Germany Application September 28, 1931, Serial No.565,629 In Germany March 13, 1931 Cl ims. (01,- 51- 0 The inventionrelates to grinding the treads of wheelrims for rail and like vehicles,by means of a grindingdisc composed of separate segments. According tothe invention these grinding segments, which may be divided or not, aredisposed on the rim of the grinding disc in such a manner as to beeasily displaceable in the axial directionfand adjusted in proportion asthey wear down. With this object, the segments are pro- .videdinaddition to the usual locking by means of external transverse wedges,with a central longitudinal bore and with an auxiliary clamping deviceconsisting of a hollow pin (adapted to be driven up) and acting 'on thewalls of the bore. In proportion as the segments wear down and areadjusted, spacing members or terminal blocks can be inserted so that thesegments can be utilized almost completely, whilst remaining secured onthe rim of the disc in the same reliable manner throughout. With thisarrangement the inconvenience might arise of the grinding segmentsbreaking away owing to the acute angle they form with the tread, andthat it is difficult to grind out with these segments the sweep of therim.

Another feature of the invention consists, with the object of obviatingthese drawbacks, in mounting the grinding segments on a disc the axis ofwhich rotates obliquely or at an angle in relation to the axis of thewheel that is to be ground, the several segments being disposed in sucha manner that their grinding surfaces coincide with the sur- In suchcase, the longitudinal axis .of the segments is sloped 'or inclined inthe rim of the grinding disc in such a manner that their longitudinalaxis intersects the axis of the grinding disc obliquely and-the wheelrim being arranged in position accordinglyethe axis ef the wheel rim atright angles. This method of mounting the segments enables the maximumgrinding efliciency to be obtained which is accomplished for example, ata peripheral velocity of 440- metres per second. In comparison with theoriginal arrangement in which a grinding disc operates axially parallelto the wheel, this method of grinding offers the advantage that theeffective diameter of the grinding disc remains constant the segmentsthough fitted with thehew fastening devices are still mounted parallelwith the axis of the disc.

Figure 2 shows a plan on a larger scale, of the means for securing thesegments on the rim of the grinding disc according to Figure l. 50

Figure 3 shows part of the rim of a grinding disc, in which the segmentsare disposed obliquely in relation to the axis of the grinding disc,their grinding surfaces therefore lying on a conical surface and beingshown in the working position in relation to a portion of a wheel rim;

Figure 4 shows a modified embodiment of the means of securing thesegment according to Fig ure 1, in partial section through the segment.Figure 5 is a plan of same, and Figured is a 10 section through the headof the segment of a modification of the embodiment according toFigure 3.

In the example, according to Figures 1 and 2, the segments a are in onepiece or divided, and ,75 provided with a suitably toughened bore. With'the aid of an inserted elastic ring at, these segments are slipped overthe longitudinally slotted pin 0 and are inserted with this in' the rim'8 of the grinding disc as shown and secured from'the .30 outside by'means of the transverse wedgebfin the usual manner. The hollow pin issplayed by means of an inserted taper screw e and the elastic ringdwhich may be screwed onto the pin is thereby pressed into the roughenedwall of the 35 bore in the segment a. In the example showri'in Figure 1,the pin is secured to the rim of the grinding disc by means of a screwthreadj Whenithe worn segment is to be readjusted, the taper screw e isloosened, the segment is drawn out a littletgo way and a terminal blockor spacing piece 9 (Figures 4; and 5) is inserted in the gap 7. Theterminal block or spacing piece g is preferably inserted from inside,i.e. pushed in from the centre outwards, so as tobe held in position bycan-- trifugal'force. For this purpose, the spacing piece is designed(Figure 5) as a slotted plate g, the slit being passed over the pin c byway of the opening f. If desired, an additional transverse wedge'b couldbe inserted on the inner side (Figure 5).. Instead of screwing the pininto the rim of the disc directly from the grinding side, as showninFigure 1, it is preferably to provide it with a round- .ed head 0,(Figure 4) at the end by which it is secured, .and to insert it fromthe rear side into the disc 3 or the cover plate of the rim of thegrinding disc, securing it in position by'mi siot the nut i and aninterposed ringh' of elastic 'rubher. This method secures the splaypininfan elastically adjustable manner. The holl'owls gq ments a-whichmay be divided or not--are then inserted from the inside as alreadydescribed with the aid of a taper screw e and an elastic bush d ofrubber or the like, and one or more drawn-in wedges b or 12 The samemethod of mounting as in Figures 1 and 4 may be employed for securingthe segments in the embodiment of the grinding disc 8 according toFigures 3 and 6. This embodiment has the advantage that the longitudinalaxes a: of the segments are disposed obliquely in relation to thecentral axis y of the grinding-disc rim. The grinding face of thesegments thus lies on the surface of a cone, and its axis isperpendicular to the axis of the wheel or wheel rim 7" that is to beground (see Figure 3). In this embodiment, the spacing pieces orterminal blocks can be inserted from inside or outside. With thisobject, a slot 1 must be provided in the rim of the grinding disc. Whena segment is worn, the taper screw e is loosened, the segment is drawnout to a corresponding extent, and a spacing piece is inserted throughthe slot 7. The spacing pieces may be of equal or unequal height and beemployed in accordance with requirements and the wear of the segments.In all embodiments screw e may also be provided with a suitablelongitudinally bore to clear out dust and for air-cooling.

I claim:

1. In a grinding device for grinding the treads of wheel rims for railand like vehicles, a grinding disc, grinding segments arranged on therim of said grinding disc, at central longitudinal bore in each segment,expansible clamping devices adapted to act on the walls or" said centrallongitudinal bores and connect the segments to the grinding disc andrecesses on the parts of the grinding disc rim carrying the segments,said recesses providing spaces through which spacing members may beinserted in order to obtain a proper distance between the grinding facesof the segments and the adjacent surface of the grinding disc when thesegments are worn.

2. In a grinding device for grinding the treads of wheel rims for railand like vehicles, a grinding disc, divided grinding segments arrangedon the rim of said grinding disc, a central longitudinal bore in eachsegment, expansible clamping devices adapted to act on the walls of saidcentral longitudinal bores and connect the segments to the grindingdisc, and recesses on the parts or the grinding disc rim carrying thesegments, said recesses providing spaces through which spacing membersmay be inserted in order to obtain a proper distance between thegrinding faces of the segments and the adjacent surface of the grindingdisc when the segments are worn.

3. In a grinding device for grinding the treads of wheel rims for railand like vehicles, a grinding disc, grinding segments arranged on therim of said grinding disc, at central longitudinal bore in each segment,expansible clamping devices adapted to act on the walls of said centrallongitudinal bores and connect the segments to the grinding disc, eachclamping device comprising a longitudinally slotted hollow pin, which isadapted to be splayed and to be pressed against the wall of the bore inthe grinding segment, and recesses on the parts of the grinding disc rimcarrying the segments, said recesses providing spaces through whichspacing members may be inserted in order to obtain a proper distancebetween the grinding faces of the segments and the adjacent surface ofthe grinding disc when the segments are worn.

4. In a grinding device for grinding-the treads of wheel rims for railand like vehicles, a grinding disc, grinding segments arranged on therim of said grinding disc, a central longitudinal bore in each segment,expansible clamping devices adapted to act on the walls of said centrallongitudinal bores and connect the segments to the grinding disc, eachclamping device comprising a longitudinally slotted hollow pin, adaptedto be driven in and carrying on the outer end an undisplaceable elasticring which, when the pin is splayed by a screw, presses into thesuitable roughened wall of the bore in the grinding segment, andrecesses on the parts of the grinding disc rim carrying the segments,said recesses providing spaces through which spacing members may beinserted in order to obtain a proper distance between the grinding facesof the segments and the adjacent surface of the grinding disc when thesegments are worn.

5. In a grinding device for grinding the treads of wheel rims for railand like vehicles, a grinding disc, grinding segments arranged on therim of said grinding disc, a central longitudinal bore in each segment,expansible clamping devices adapted to act on the walls of said central1ongitudinal bores and connect the segments to the grinding disc,external transversal wedges for securing the segments in position andrecesses on the parts of the grinding disc rim carrying the segments,said recesses providing spaces through which spacing members may beinserted in order to obtain a proper distance between the grinding facesof the segments and the adjacent surface of the grinding disc when thesegments are worn.

6. In a grinding device for grinding the treads of wheel rims for railand like vehicles, a grinding disc, axially adjustable grinding segmentsarranged on the rim of said grinding disc, a central longitudinal borein each segment, external transverse wedges for securing said grindingsegments in position and an auxiliary expansible clamping device foreach grinding segment, each clamping device being adapted to act on thewalls of the central longitudinal bore in the appertaining segment andcomprising an expansible hollow pin, which has a semi-spherical head andwhich, on being inserted into the device from the rear, is adapted tosecure the grinding segment by the aid of a taper screw screwed in fromthe front and an undisplaceable elastic ring arranged at the outer endof said hollow pin.

7. In a grinding device for grinding the treads of wheel rims for railand like vehicles, a grind ing disc, axially adjustable grindingsegments arranged on the rim of said grinding disc in such a manner,that their longitudinal axis is obliquely arranged in relation to theaxis of the grinding disc and perpendicular in relation to the axis ofthe wheel, and their grinding faces lying on the surface of a cone.

8. Ina grinding device for grinding the treads of wheel rims for railand like vehicles, a grinding disc, axially adjustable grinding segmentsarranged on the rim of said grinding disc and recesses in the rim ofsaid grinding disc adapted to receive spacing members in order to obtaina proper distance between the grinding faces of the segments and theadjacent surface of. the grinding disc when the segments are worn, saidspacing members comprising plates, slotted in the shape of a fork on oneside, and adapted to be inserted through openings or slots provided onthe inner side of the disc rim.

9. In a grinding device for grinding the treads of wheel rims for railand like vehicles, a grinding disc, axially adjustable grinding segmentsarranged'on the rim of said grinding disc, a central longitudinal borein each segment, clamping devices acting on the walls of said centrallongitudinal bore in the segments, each clamping device comprising alongitudinally slotted hollow pin adapted to be driven in and carryingon the outer end an undisplaceable elastic ring which, when the pin issplayed by a screw, presses into the suitable roughened wall of the borein the grinding segment, recesses in the disc rim, spacing membersadapted to be inserted into said recesses in order to obtain a properdistance between the grinding faces of the segments and the adjacentsurface of the grinding disc when the segments are worn, said spacingpieces comprising plates, slotted in the shape of a fork on one side,and openings for receiving said plates provided on the inner side of thedisc rim.

10. In a grinding device for grinding the treads of wheel rims for railand like vehicles, a grinding disc, divided grinding segments arrangedon the rim of said grinding disc, a central longitudinal bore in eachsegment and expansible clamping devices adapted to act on the walls ofsaid bores and to fasten said segments to the grinding disc.

EWALD HANUS.

